The global shorcuts keys are a very useful way to perform actions which should works independently of the running application.

At this moment kde lacks the possibility to define new global shorcuts, like for example the volume control. In many situations the volume controls are not very fast (click over the kmix icon, click over the volume slider and pull it down until the volume is ok, click away to make the slider disappear).

I wish to assign the keypad +/- keys the volume control. An OSD bar should inform about the volume status.
That's what actually happens with gnome).

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I actually just wrote something like this today for myself and put it up on kde-look. VVD is a program which allows you to change the volume of an audio channel. When used with conjunction with kde hotkeys in kcontrol I think it could accomplish exactly what you want.

As I said I just wrote this today so it isn't very polished. Right now the OSD is a plain progress bar, but I plan on improving it in the future.

I'm hoping, with KDE4's new audio mixing system, we'll never have to adjust the volume again. If the system knows when I'm watching movies, when I'm listening to music, when I'm playing games, what is an alarm from kontact, and when I'm doing that stuff through speakers or headphones, then I'll be able to just set everything to preferred volumes once, and forget it :)